"I was like, 'Who the heck is that!?'" Wilson recalls. "The energy and just the whole presence. I was like, 'Let's invite them to play for us at the Hollywood Bowl for the two nights.' And that's when we came together and started talking about something else we could try to do. Because she wants to really rock and I love the funk."

But Wilson wasn't the first music legend who contacted Warfield after becoming a fan from afar. Prince hired Warfield as a background singer after being enamored with her cover of "Gimme Shelter."

"Honestly, [Prince] was just so inviting and so relaxed," Warfield says. "He just welcomed me into his home...He really supported me. He was very, very generous with his light, you know? And I'm just really thankful for that because I learned so much from him."

Roadcase Royale's debut album, First Things First, contains several great original songs, along with a few covers, including Heart's "These Dreams," which the band performed live in the studio for "Out of the Box."

"'These Dreams' is one that was always a big favorite of so many Heart fans," Wilson says. "But now it's a different way of saying the song because Liv and I share the song."